Venturi Device Helicoidal Rear Member Oxygen Fraction Control

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Solution Overview

Problem

Existing venturi devices for regulating oxygen fraction in medical settings are prone to accidental position changes, leading to incorrect gas delivery compositions, and often fail to provide pure oxygen due to leaks.

Innovation Solution

A venturi device with a rear member that moves helicoidally with respect to the main body, allowing manual selection of open or closed positions to control oxygen and air mixture delivery, thereby preventing accidental position changes and ensuring accurate gas composition.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If axial-sliding mobile parts are used for regulation, then ease of operation is improved, but reliability deteriorates due to accidental sliding and wrong position setting

Engineering Contradiction:

Improveease of operationVSAvoidreliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent replaces linear axial-sliding motion with helicoidal (screw-like) rotational motion. The mobile part rotates around an axis rather than sliding linearly, transforming the control mechanism into a rotary dial that is more resistant to accidental displacement while maintaining ease of user operation through simple rotational action.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent substitutes the mechanical axial-sliding system with a helicoidal rotational system. This mechanical substitution changes the degree of freedom from linear translation to rotational movement, providing inherent stability against accidental position changes while preserving user-friendly operation through the intuitive rotary interface.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If axial-sliding mobile parts are used for regulation, then device complexity is reduced, but reliability deteriorates due to inability to provide pure oxygen due to leaks

Engineering Contradiction:

Improvedevice complexityVSAvoidreliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The helicoidal rotational mechanism provides more reliable sealing compared to axial sliding. The rotary motion allows for better contact between sealing surfaces, reducing leaks and enabling reliable delivery of pure oxygen when the mobile part is in the closed position, without significantly increasing device complexity.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

By replacing the axial-sliding mechanical system with a helicoidal rotational system, the patent achieves improved sealing performance. The rotary configuration allows for more effective sealing surfaces that prevent air leaks, ensuring that pure oxygen can be reliably delivered when needed.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If simple non-invasive ventilation devices are used, then ease of operation is improved, but measurement precision deteriorates in controlling oxygen fraction

Engineering Contradiction:

Improveease of operationVSAvoidmeasurement precision

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The helicoidal rotational control mechanism provides more precise control over the oxygen fraction compared to simple axial sliding. The rotary dial allows for finer incremental adjustments, enabling more accurate selection of the desired oxygen concentration while maintaining ease of operation through the intuitive rotational interface.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The substitution of axial-sliding motion with helicoidal rotational motion enhances the precision of oxygen fraction control. The rotary mechanism allows for more precise positioning and finer control increments, improving the accuracy of gas composition regulation while keeping the device simple and easy to operate.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The helicoidal motion mechanism stabilizes the venturi device in desired positions, preventing incorrect gas delivery and ensuring accurate oxygen fraction regulation, thus enhancing patient safety by maintaining precise gas composition.

Implementation Method 1

a venturi nozzle (20) arranged in said inner compartment (11)

Methodology Applied

Scientific EffectVenturi effect: Venturi Effect

Data Source

PatentEP4233949B1Venturi device for regulating the oxygen fraction in respiratory therapies

Publication Date: 2025.04.23 AIR LIQUIDE MEDICAL

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Figure 5~6BA

AI summary

The invention concerns a venturi device (1) for delivering oxygen or an air/oxygen mixture comprising a main body (10) with an inner compartment (11) and a venturi nozzle (20); a rear member (30) with an oxygen inlet (31), air inlets (32) and a mixing chamber (33) for mixing oxygen and air. The rear member (30) is mobile with respect to the main body (10) between a closed position wherein the rear member (30) provides oxygen to the venturi nozzle (20), and an open position wherein the rear member (30) provides an air/oxygen mixture to the venturi nozzle (20). The rear member (30) is mobile at least in rotation with respect to the main body (10) for allowing a user to manually select a desired open or closed position, preferably according to a helicoidal motion. Installation (100) for providing oxygen or an air/oxygen mixture to a patient comprising a gas reservoir (101), a flexible hose (103), a respiratory interface (104), a connecting hollow body (102), and such a venturi device (1).